When Faint Squares Appear Around Desktop Icons

For the past few weeks, I have been seeing faint gray squares around some (not all) of my desktop icons.

Prism, WavePad, and OBS have the square, but the others don't

I researched the issue, and apparently the squares surround icons that didn't get resized. Resized? The issue appears when the icon size on the desktop is changed to something non-even by holding the Control key and scrolling the mouse wheel. I'm not sure what causes some icons to resize and some not.

The standard size can be restored by choosing an icon size under "View" in the desktop's context menu.